linux-kernel - Re: [PATCH v2] Input: Make ADS7846 independent on regulator

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Message-ID: <4CAACA63.6090202@compulab.co.il>
Date:	Tue, 05 Oct 2010 08:49:07 +0200
From:	Igor Grinberg <grinberg@...pulab.co.il>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Marek Vasut <marek.vasut@...il.com>,
	linux-arm-kernel@...ts.infradead.org, vapier@...too.org,
	khilman@...prootsystems.com, dmitry.torokhov@...il.com,
	linux-kernel@...r.kernel.org, pavel@....cz,
	linux-input@...r.kernel.org, eric.y.miao@...il.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH v2] Input: Make ADS7846 independent on regulator

 On 09/09/10 12:41, Mark Brown wrote:
> On Thu, Sep 09, 2010 at 10:27:17AM +0200, Marek Vasut wrote:
>> Dne Út 7. září 2010 14:53:35 Mark Brown napsal(a):
>>> From a regulator API usage point of view a separate implementation of
>>> the same thing was nacked - there are regulator API facilties for hiding
>>> missing regulators from drivers when needed to get systems going, unless
>>> the device genuinely can cope without supplies it should be relying on
>>> those.

I actually, don't see why ads7846 is strictly relying on the regulator
and I don't understand, why ads7846 driver has to bail out if the regulator
is not found? Why shouldn't the driver try to continue?
I think it should bail out only in case communicating with the device failed.

>> Maybe these platforms should have been fixed prior to applying the patch adding 
>> regulator goo into ads7846 driver then. What's the way to go now then ?
> Fix the platforms and use the dummy regulators to keep them going until
> that happens.  It's trivial to do the hookup in the platforms.

You want each platform, that does not have a special regulated power supply
for the ads7846, to define a dummy regulator just to cope with that artificial
dependency of the device driver?
I think it is a waste and big code duplication in each platform
that does not have that special regulator.

-- 
Regards,
Igor.

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